Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a display screen or portion thereof with transitional graphical user interface in accordance with the claimed design;

FIG. 2 is a front view of a second image thereof;

FIG. 3 is a front view of a third image thereof;

FIG. 4 is a front view of a fourth image thereof; and,

FIG. 5 is a front view of a fifth image thereof.

The evenly spaced broken lines show portions of the display screen or portion thereof with transitional graphical user interface which form no part of the claimed design. The dot-dash broken lines define the bounds of the claimed design and form no part thereof.

The appearance of the transitional graphical user interface sequentially transitions between the images shown in the Figures. The process or period in which one image transitions to another image forms no part of the claimed design. 

CLAIM The ornamental design for a display screen or portion thereof with transitional graphical user interface, as shown and described. 